Where does the CSL take its speedo reading from?

**Mike R** · 03-04-2013, 10:19 AM

Just wondering for future reference, as one of the things I have found is that the standard final drive is just so LOOOOOOOOOONNNGGGGGG, that it really dulls the performance. So was wondering how the speedo would be affected by fitting a 3.9 final drive? For example, if it was in the gearbox, then it would under-read with this diff, but if it went off wheel speed, it would be fine

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Thanks in advance

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_Nathan_ · 03-04-2013, 10:32 AM

Ground speed calculated from the 4 wheel speeds via ABS

4.1 on mine and speedo was fine.

**Mike R** · 03-04-2013, 10:35 AM

Quote:

Originally Posted by _Nathan_

Ground speed calculated from the 4 wheel speeds via ABS

4.1 on mine and speedo was fine.

Thanks Nath

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hoshy · 04-04-2013, 12:11 PM

You're in the BMW world now... they'd never do anything so silly as using the box for speed signal.

**shimmy** · 04-04-2013, 03:23 PM

Quote:

Originally Posted by _Nathan_

Ground speed calculated from the 4 wheel speeds via ABS

4.1 on mine and speedo was fine.

I'm not sure how you know that coz it never moves from Lydney!!!

_Nathan_ · 04-04-2013, 08:50 PM

Mainly cause I got the pin out and CAN info for the ABS unit

New suspension now in the same room as the car, almost got enough parts to put it back together now

shane@mbtech · 04-04-2013, 09:13 PM

NSR wheel speed sensor.

Undo that and your speedo will not work.

03-04-2013, 10:19 AM	#1
Mike R S6, Sport On, Traction Off Join Date: Dec 2010 Location: Norwich Posts: 1,585 Casino cash: $17591	Where does the CSL take its speedo reading from? Just wondering for future reference, as one of the things I have found is that the standard final drive is just so LOOOOOOOOOONNNGGGGGG, that it really dulls the performance. So was wondering how the speedo would be affected by fitting a 3.9 final drive? For example, if it was in the gearbox, then it would under-read with this diff, but if it went off wheel speed, it would be fine . Thanks in advance . __________________ Mike R Sarcasm is just a free service I provide. Nordschleife, there's only two barriers to worry about - the ones on the left and the ones on the right . CSL number 044

03-04-2013, 10:32 AM	#2
_Nathan_ Driving it like I nicked it Join Date: Sep 2008 Posts: 2,099 Casino cash: $13060	Ground speed calculated from the 4 wheel speeds via ABS 4.1 on mine and speedo was fine. __________________ Nathan

04-04-2013, 08:50 PM	#6
_Nathan_ Driving it like I nicked it Join Date: Sep 2008 Posts: 2,099 Casino cash: $13060	Mainly cause I got the pin out and CAN info for the ABS unit New suspension now in the same room as the car, almost got enough parts to put it back together now __________________ Nathan

04-04-2013, 12:11 PM	#4
hoshy S3 - On the open road Join Date: Feb 2012 Posts: 80 Casino cash: $833	You're in the BMW world now... they'd never do anything so silly as using the box for speed signal.

04-04-2013, 09:13 PM	#7
shane@mbtech CSL Register Uber-poster! Join Date: Feb 2009 Location: warrington Posts: 5,419 Casino cash: $19783	NSR wheel speed sensor. Undo that and your speedo will not work.